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On many Federationstarships, the secondary hull (also known as the engineering hull, the engineering section, the stardrive section, or the battle section) is a major component of the overall hull structure. The secondary hull is generally located behind and below the primary hull.

The secondary hull is usually dedicated to engineering and support functions, especially in starships built after the mid-23rd century. It is the home of the warp drive, Main Engineering, and other engineering support systems. Separating these potentially dangerous systems from the majority of the crew, located in the primary hull, allows the secondary hull to be abandoned in the event of catastrophic damage to the warp core or a loss of antimatter containment.

On Galaxy-class starships, the secondary hull is usually referred to as the battle section because it mounts the majority of the ship's weaponry and is intended to enter combat or other dangerous situations following a saucer separation. The saucer module, containing the majority of the ship's crew (including civilians) can then retreat to safety. Both sections can operate without one another for long periods of time. Once the crisis is resolved, the two sections can reconnect. Because of this, the battle section was designed with duplicates of systems usually found only in the primary hull, including a battle bridge, captain's ready room, sickbay, crew quarters, corridor, transporter room, a computer core, and other mission-critical facilities. (TNG: "Encounter at Farpoint")